two options are the Delta method (see, e.g., function deltamethod() in package 'msm'), and the Bootstrap method (check package 'boot').
I hope it helps. Best, Dimitris ---- Dimitris Rizopoulos Ph.D. Student Biostatistical Centre School of Public Health Catholic University of Leuven Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/(0)16/336899 Fax: +32/(0)16/337015 Web: http://med.kuleuven.be/biostat/ http://www.student.kuleuven.be/~m0390867/dimitris.htm ----- Original Message ----- From: "Irene Mantzouni" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Monday, February 18, 2008 3:22 PM Subject: [R] mean and variance of ratio > Hi all! > > > > I try to estimate a statistic of the form: (x1-x2)/(y1-y2), where > x1,x2,y1,y2 represent variable means, so each has an estimate and > standard error associated with it. > > How is it possible to estimate the mean and the variance of this > ratio? > > > > Thank you! > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
